Mark Kropf's personal site
CTO turned founder. Rensei is the startup, Supaku is the lab. Before that I was CTO at Genius Sports, and before that at Google Cloud and Pivotal. I hold patents in application security and banking systems.
I write occasionally, keep a webring of friends who still have personal sites, and live in New York with my wife and our three kids.
Now
- Rensei
- The startup. A control plane for fleets of coding agents, with an open source execution layer called donmai underneath it. rensei.ai
- Supaku
- The lab. Small products I wanted to exist, like Yuisei, a personal CRM, and the open source work below. supaku.com
Open source
- kith
- Apple Contacts and iMessage, read-only, for terminals and agents.
- kinring
- Build, host, and join webrings. Runs the ring on this site.
- payload-auth-workos
- WorkOS sign-in for Payload CMS.
- payload-auth-cookie
- Shared session cookies between Payload apps.
More on supaku.com and GitHub.
Writing
Friends
The buttons go here. 88 by 31 pixels, like it is 1999.
Have a site? Join Mark's ring. The last two are mine, if you want to link back.